Merge branch 'jn/grep-open'

* jn/grep-open: t/t7811-grep-open.sh: remove broken/redundant creation of fake "less" script t/t7811-grep-open.sh: ensure fake "less" is made executable t/lib-pager.sh: remove unnecessary '^' from 'expr' regular expression grep -O: allow optional argument specifying the pager (or editor) grep: Add the option '--open-files-in-pager' Unify code paths of threaded greps grep: refactor grep_objects loop into its own function Conflicts: t/t7006-pager.sh